RE: Actual infinities.
October 17, 2017 at 3:43 pm
(This post was last modified: October 17, 2017 at 3:47 pm by Jehanne.)
(October 17, 2017 at 3:33 pm)RoadRunner79 Wrote: It cannot be distance, because at each point, I have traversed a finite distance. You have only showed that you can have an actual infinity as an abstract concept, and have not showed any relation to the points traversed.
This is where we disagree. The ordinal number of points (that is, discrete elements, call them "epsilon", if you wish) between any 2 points, sums to an actual infinite, if space is continuous.
(October 17, 2017 at 3:07 pm)Ignorant Wrote:(October 17, 2017 at 12:15 pm)Jehanne Wrote: Physics is complete as far as the everyday world is concerned (hence, the "Everyday Equation"). If you disagree, what is there left for physics to explain?
I don't know enough to disagree about whether or not physics is complete regarding the everyday world. Why qualify the world with "everyday"? What other sort of world happens less frequently?
Does physics account for (an) essentially necessary thing(s)? In other words, many philosophers and scientists maintain that there must be at least one thing that just necessarily is (and could not NOT be) at every moment. Does physics account for that? If so, how?
Physics, via QFT (Quantum Field Theory), which consists of QED (Quantum Electrodynamics) and QCD (Quantum Chromodynamics), explains the strong and electroweak fundamental forces of Nature, while General Relativity provides a classical description of gravity. There is simply no need to posit anything beyond this, even if it is the case (and, it is) that certain phenomenon (such as all of biology) are not reducible to QFT or GR.
